Clock



FIG. 1 is a front elevation view of a clock;

FIG. 2 is one side view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is the opposite side view thereof;

FIG. 7 is a front perspective view thereof; and,

FIG. 8 is a rear perspective view thereof. 

I claim the ornamental design for a clock, as shown and described. 